1. Forcing me to stay on budget, unless there's an emergency (perhaps allow purchases over budget after the third attempt).
2. Automatically distribute paychecks or other income into different accounts (some to retirement, some to savings, some to checking, w/e...); this behavior could change based on the current distribution of your money too, so if your "emergency fund" got really low you could automatically spend more of your income replenishing it.
3. Deny unwanted transactions and tightly control your own fraud detection (SMS confirmation for every purchase out of your zip code, confirmations for purchases from new places, you name it...).
4. Automate the creation and destruction of virtual cards to minimize danger of online purchases or to make sure that "free trial" never starts charging you.
I'm sure there's tons of other awesome ideas, but I want all of these quite badly.